save checkpoint. addition features and their state. check some ofthem
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# Graph Indexer Incremental Update Pipeline
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## Module
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Graph
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## Status
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VERIFIED
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## Description
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Change-stream processor for incremental graph updates, consuming SBOM/scan events and applying delta mutations to the indexed graph with idempotency tracking and backfill metrics.
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## Implementation Details
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- **Change stream processor**: `src/Graph/StellaOps.Graph.Indexer/Incremental/GraphChangeStreamProcessor.cs` -- consumes SBOM/scan events and applies delta mutations to indexed graph
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- **Change event model**: `src/Graph/StellaOps.Graph.Indexer/Incremental/GraphChangeEvent.cs` -- event model for graph mutations
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- **Stream options**: `src/Graph/StellaOps.Graph.Indexer/Incremental/GraphChangeStreamOptions.cs` -- configurable stream processing parameters
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- **Idempotency store**: `src/Graph/StellaOps.Graph.Indexer/Incremental/InMemoryIdempotencyStore.cs` -- in-memory deduplication for event processing
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- **Postgres idempotency**: `src/Graph/__Libraries/StellaOps.Graph.Indexer.Persistence/Postgres/Repositories/PostgresIdempotencyStore.cs` -- PostgreSQL-backed idempotency tracking
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- **No-op event source**: `src/Graph/StellaOps.Graph.Indexer/Incremental/NoOpGraphChangeEventSource.cs` -- stub event source for testing
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- **Backfill metrics**: `src/Graph/StellaOps.Graph.Indexer/Incremental/GraphBackfillMetrics.cs` -- metrics for backfill operations
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- **DI extensions**: `src/Graph/StellaOps.Graph.Indexer/Incremental/GraphChangeStreamServiceCollectionExtensions.cs` -- DI registration
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- **SBOM ingestion**: `src/Graph/StellaOps.Graph.Indexer/Ingestion/Sbom/SbomIngestProcessor.cs`, `SbomIngestTransformer.cs` -- SBOM event processing and graph transformation
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- **Tests**: `src/Graph/__Tests/StellaOps.Graph.Indexer.Tests/GraphChangeStreamProcessorTests.cs`, `GraphIndexerEndToEndTests.cs`
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- **Persistence tests**: `src/Graph/__Tests/StellaOps.Graph.Indexer.Persistence.Tests/PostgresIdempotencyStoreTests.cs`
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- **Source**: SPRINT_0141_0001_0001_graph_indexer.md
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## E2E Test Plan
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- [x] Verify change stream processor applies delta mutations correctly
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- [x] Test idempotency ensures duplicate events are not processed
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- [x] Verify backfill metrics track progress accurately
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- [x] Test SBOM ingestion transforms events into graph updates
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- [ ] Verify PostgreSQL idempotency store persists across restarts (skipped: Docker unavailable)
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## Verification
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- **Run ID**: run-001
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- **Date**: 2026-02-09T16:00:00Z
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- **Tier**: 1 (Build + Test)
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- **Result**: PASS
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- **Evidence**: Graph.Indexer.Tests 37/37 pass. 4 PostgresIdempotencyStore tests skipped (Docker unavailable, env_issue). All source files verified (13/13).
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